Add skeleton protocol methods

Source/NSFilePromiseProvider.m

@@ -1,21 +1,21 @@
 /* Implementation of class NSFilePromiseProvider
    Copyright (C) 2024 Free Software Foundation, Inc.
-   
+
    By: Gregory John Casamento
    Date: 05-05-2024
 
    This file is part of the GNUstep Library.
-   
+
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.
-   
+
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.
-   
+
    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free
    Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
@@ -38,10 +38,16 @@
       ASSIGN(_fileType, fileType);
       _delegate = delegate;
     }
-  
+
   return self;
 }
 
+- (void) dealloc
+{
+  RELEASE(_fileType);
+  [super dealloc];
+}
+
 - (id<NSFilePromiseProviderDelegate>) delegate
 {
   return _delegate;
@@ -72,5 +78,14 @@
   ASSIGN(_userInfo, userInfo);
 }
 
-@end
+- (NSArray *) writableTypesForPasteboard: (NSPasteboard *)pasteboard
+{
+  return nil;
+}
 
+- (id) pasteboardPropertyListForType: (NSString *)type
+{
+  return nil;
+}
+
+@end

Source/NSFilePromiseReceiver.m

@@ -45,6 +45,11 @@
   return self;
 }
 
++ (NSArray *) readableTypesForPasteboard: (NSPasteboard *)pasteboard
+{
+  return nil;
+}
+
 // NSPasteboardReading protocol -- end
 
 - (void) dealloc